DE82517T1 - DEVICE AND METHOD FOR PRODUCING OPTICAL FIBERS. - Google Patents

DEVICE AND METHOD FOR PRODUCING OPTICAL FIBERS.

Info

Publication number
DE82517T1
DE82517T1 DE198282111815T DE82111815T DE82517T1 DE 82517 T1 DE82517 T1 DE 82517T1 DE 198282111815 T DE198282111815 T DE 198282111815T DE 82111815 T DE82111815 T DE 82111815T DE 82517 T1 DE82517 T1 DE 82517T1
Authority
DE
Germany
Prior art keywords
materials
core
fiber
melting vessel
melting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE198282111815T
Other languages
German (de)
Inventor
Eros Torino Modone
Giacomo Cogoleto Roba (Ge)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telecom Italia SpA
Original Assignee
CSELT Centro Studi e Laboratori Telecomunicazioni SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CSELT Centro Studi e Laboratori Telecomunicazioni SpA filed Critical CSELT Centro Studi e Laboratori Telecomunicazioni SpA
Publication of DE82517T1 publication Critical patent/DE82517T1/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/022—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from molten glass in which the resultant product consists of different sorts of glass or is characterised by shape, e.g. hollow fibres, undulated fibres, fibres presenting a rough surface
    • C03B37/023—Fibres composed of different sorts of glass, e.g. glass optical fibres, made by the double crucible technique
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
    • C03B37/02736—Means for supporting, rotating or feeding the tubes, rods, fibres or filaments to be drawn, e.g. fibre draw towers, preform alignment, butt-joining preforms or dummy parts during feeding
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00—Type of glass produced
    • C03B2201/06—Doped silica-based glasses
    • C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00—Type of glass produced
    • C03B2201/80—Non-oxide glasses or glass-type compositions
    • C03B2201/82—Fluoride glasses, e.g. ZBLAN glass
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00—Type of glass produced
    • C03B2201/80—Non-oxide glasses or glass-type compositions
    • C03B2201/84—Halide glasses other than fluoride glasses, i.e. Cl, Br or I glasses, e.g. AgCl-AgBr "glass"
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/12—Drawing solid optical fibre directly from a hollow preform
    • C03B2205/13—Drawing solid optical fibre directly from a hollow preform from a hollow glass tube containing glass-forming material in particulate form, e.g. to form the core by melting the powder during drawing

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)
  • Glass Compositions (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The apparatus is composed of two coaxial crucibles (3, 4) the outer one (4) presenting a low-softening temperature, so that it might be drawn with the raw materials. Thus a fibre is obtained with an outer coating which protects it against atmospheric agents. According to this process raw materials are used allowing the fabrication of fibres which may be used to transmit optical radiations with wavelengths longer than 5 mu m, with an attenuation minimum lower that 10<-3> dB/km.

Claims (12)

Übersetzung der PatentansprücheTranslation of the claims 1. Vorrichtung zum Herstellen optischer Fasern, bestehend aus einem ersten Schmelzgefäß (3), das in einer Düse endet, und einem zweiten Schmelzgefäß (4), das das erste Schmelzgefäß umgibt, dadurch gekennzeichnet, daß die Erweichungstemperatur des ersten Schmelzgefäßes höher liegt als die des Rohmaterials, aus dem die optischen Fasern hergestellt werden, und am unteren Ende einen Meniskus aufweist, der durch Ziehen erhalten wird, und daß das zweite Schmelzgefäß aus niedrig schmelzendem Glas mit einer Erweichungstemperatur etwa gleich der des Rohmaterials besteht und einen Meniskus aufweist, der unmittelbar während des Faserziehens erhalten wird; und daß weiterhin mechanische Vorrichtungen (5,9) zum Vorschieben des ersten Schmelzgefäßes unter Bewirkung des Versatzes einer Stange (8) aus den Materialien, die den Faserkern bilden sollen, und des Versatzes des zweiten Schmelzgefäßes zusammen mit den zwischen die beiden Schmelzgefäße eingefügten Materialien, die den Faserman-1. Apparatus for producing optical fibers, consisting of a first melting vessel (3) which ends in a nozzle, and a second melting vessel (4) which surrounds the first melting vessel, characterized in that the softening temperature of the first melting vessel is higher than that of the raw material from which the optical fibers are made and at the lower end has a meniscus which is obtained by drawing, and that the second melting vessel is made of low-melting glass having a softening temperature approximately equal to that of the raw material and has a meniscus which is immediately obtained during fiber drawing; and that further mechanical devices (5,9) for advancing the first melting vessel, causing the displacement of a rod (8) made of the materials which are to form the fiber core and the displacement of the second melting vessel together with the materials inserted between the two melting vessels, the fiber man tel bilden sollen, ferner ein erster Ofen (Ij für die Verglasung der in den Schmelzgefäßen enthaltenen Materialien Una einen zweiten Ofen (2) für das Ziehen vorhanaen sind.tel are to form, furthermore a first furnace (Ij for the vitrification of the materials contained in the melting vessels and a second furnace (2) for drawing are provided. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die mechanischen Vorrichtungen (5, 9) Schraubvorrichtungen zuiii Vermindern der Versatzgeschwindigkeit auf einen solchen Wert umfassen, daß die im Ziehbereich eintreffende Materialmenge die zum Ziehen der optischen Faser abgezogene Materialmenge ausgleicht.2. Device according to claim 1, characterized in that the mechanical devices (5, 9) screw devices toiii reduce the offset speed to one such a value that the amount of material arriving in the drawing area is that for drawing the optical Fiber compensates for the amount of material withdrawn. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das zweite Schmelzgefäß (4) aus Glas besteht, aessen Glasübergangstemperatur, Dichte und thermischer ExpansionsKoeffizient aenen des Materials gleichen, aus dem der Kern und der Mantel aufgebaut sind.3. Apparatus according to claim 1 or 2, characterized in that the second melting vessel (4) consists of glass, The glass transition temperature, density and thermal expansion coefficient equalize the material which the core and the jacket are built up. 4. Verfahren zur Herstellung optischer Fasern unter Verwendung cer Vorrichtung nach einem der vorhergehenden Ansprüche, dadurcn gekennzeichnet, daß man die Materialien, die den Faserkern bilden sollen, und die Materialien, die den Fasermantel bilden sollen, in das erste Schmelzgefäß (3) bzw.. zwischen das erste und das zweite Schmelzgefäß (4) einbringt, nachdem man sie gereinigt und zum Erhalten einer homogenen Zusammensetzung an jedem Punkt gemischt hat, daß man dann unverglaste Materialien verglast und bereits verglaste Materialien durch thermische Diffussion weiter.. reinigt und daß man aann das Faserziehen beginnt, indem man den Bereich mit Düse und Meniskus der Schmelzgefäße auf die Erweichungstemperatur der Rohmaterialien und des zweiten Schmelzgefäßes anhebt und dann den Verbrauch des in der gezogenen Faser verwendeten Materials ausgleicht, indem man die zweite Düse, die Rohmaterialien, die den Mantel bilden sollen, und die Rohmaterialien, die den Kern bilden sollen, in die selbe Richtung wie die Faserziehrichtung4. A method for producing optical fibers using cer device according to one of the preceding claims, characterized in that the materials that are to form the fiber core, and the materials that are to form the fiber cladding, in the first melting vessel (3) or . Introduces between the first and the second melting vessel (4) after they have been cleaned and mixed at each point to obtain a homogeneous composition, that unglazed materials are then vitrified and materials that have already been vitrified are further cleaned by thermal diffusion, and that one can fiber drawing begins by raising the nozzle and meniscus area of the melting vessels to the softening temperature of the raw materials and the second melting vessel and then compensating for the consumption of the material used in the drawn fiber by using the second nozzle, the raw materials that form the jacket should, and the raw materials, which should form the core, in the same e direction as the fiber pulling direction i,ii.t einer Geschwindigkeit versetzt, die dem geforderten Vernältnis zwischen dem Kerndurchmesser und dem l'Ianteldurchmesser entspricht.i, ii.t a speed that is required Proportion between the core diameter and the lantel diameter is equivalent to. 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß man die den Kern bildenden Materialien in die erste Düse als Pulver einführt und sie dann verglast.5. The method according to claim 4, characterized in that the materials forming the core in the first nozzle as a powder and then vitrified. 6. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß man die den Kern bildenden Materialien in die erste Düse bereits verglast und in Stabform einführt.6. The method according to claim 4, characterized in that the materials forming the core in the first nozzle already glazed and introduced in stick form. 7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß man als Rohmaterialien zur Bildung aes Faserkerns und des Mantels Kalogenide verwendet.7. The method according to any one of claims 1 to 6, characterized in that there is used as raw materials for formation aes fiber core and sheath calogenides are used. 3. Verfahren nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß man Rohmaterialien zur Bildung des Fasericerns und des Mantels verwendet, die Chloride enthalten. 3. The method according to any one of claims 4 to 7, characterized in that raw materials for forming the Fiber core and sheath used that contain chlorides. 9. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß man Rohmaterialien zur Bildung des Faserkerns und des Mantels verwendet, die Chloride von Elementen mit hohem Atomgewicht für die Konstruktion der Glasmatrix enthalten und in geringerer Menge Chloride von Elementen mit niedrigerem Atomgewicht zum Erhöhen der Matrixstabilität und zum Erhalten optischer Fasern mit einer größeren Bandbreite enthalten.9. The method according to claim 3, characterized in that raw materials for forming the fiber core and the Mantels, which contain chlorides of elements with high atomic weight for the construction of the glass matrix and in a lesser amount chlorides of elements of lower atomic weight to increase matrix stability and for obtaining optical fibers with a wider bandwidth. 10. Verfahren nach Ansprucn 9, dadurch gekennzeichnet, daß die Elemente mit hohem Atomgewicht Hf, Zr, Th, Ba, La, Pb und/oder Bi sind. ~10. The method according to claims 9, characterized in that the elements with high atomic weight Hf, Zr, Th, Ba, La, Are Pb and / or Bi. ~ ' ■-■-■ ' ■ : ' ■■■ ' " ' '■■ ■■" : '. ·■■■■ ■ ■'■ - ■ - ■' ■: '■■■'"'' ■■ ■■" : '. · ■■■■ ■ ■ 11. Verfahren nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß die Elemente mit dem niedrigeren Atomgewicht Al und/oder Zn sind.11. The method according to claim 9 or 10, characterized in that that the elements with the lower atomic weight are Al and / or Zn. 12. Optische Fasern, die nach einem Verfahren gemäß einem der Ansprüche 4 bis 11 hergestellt sind, dadurch gekennzeicnnet, daß sie einen inneren Kern und einen den Kern uuiäeDenden Mantel, die aus diesen Rohmaterialien bestehen, und eine den Mantel umgebende Beschichtung, die aus dem Glas, aus dem das zweite Schnielzgefäß (4) besteht, hergestellt ist, aufweisen.12. Optical fibers of the claims are 4 to 11 prepared by a process according to, characterized gekennzeicnnet that it comprises an inner core and a core uui ä eDenden coat, consisting of these raw materials, and a jacket surrounding the coating made of the glass from which the second Schnielz vessel (4) is made.
DE198282111815T 1981-12-22 1982-12-20 DEVICE AND METHOD FOR PRODUCING OPTICAL FIBERS. Pending DE82517T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT68655/81A IT1145605B (en) 1981-12-22 1981-12-22 APPARATUS AND PROCEDURE FOR THE PRODUCTION OF OPTICAL FIBERS

Publications (1)

Publication Number Publication Date
DE82517T1 true DE82517T1 (en) 1983-12-08

Family

ID=11310179

Family Applications (2)

Application Number Title Priority Date Filing Date
DE8282111815T Expired DE3270048D1 (en) 1981-12-22 1982-12-20 Apparatus and process for the fabrication of optical fibres
DE198282111815T Pending DE82517T1 (en) 1981-12-22 1982-12-20 DEVICE AND METHOD FOR PRODUCING OPTICAL FIBERS.

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE8282111815T Expired DE3270048D1 (en) 1981-12-22 1982-12-20 Apparatus and process for the fabrication of optical fibres

Country Status (10)

Country Link
EP (1) EP0082517B1 (en)
JP (1) JPS5941932B2 (en)
AT (1) ATE18661T1 (en)
AU (1) AU536495B2 (en)
BR (1) BR8207118A (en)
DE (2) DE3270048D1 (en)
DK (1) DK547582A (en)
ES (1) ES8402430A1 (en)
IT (1) IT1145605B (en)
NO (1) NO155930C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6250112B1 (en) 1999-06-03 2001-06-26 Corning Incorporated Method of controlling an extrusion of glass to make an optical fiber
EP1099669A1 (en) * 1999-11-04 2001-05-16 Corning Incorporated Flow control for optical fiber fabrication using the double crucible technique
US6550279B1 (en) 2000-09-01 2003-04-22 Corning Incorporated Process for drawing optical fiber from a multiple crucible apparatus with a thermal gradient

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1496223A (en) * 1966-08-19 1967-09-29 Saint Gobain Process and device for the manufacture of so-called fibers
US3791806A (en) * 1969-12-30 1974-02-12 Nippon Selfoc Co Ltd Continuous production of light-conducting glass fibers with ion diffusion
GB1340849A (en) * 1972-04-06 1973-12-19 Standard Telephones Cables Ltd Optical fibres
JPS5323166B2 (en) * 1973-08-22 1978-07-13
JPS5813135B2 (en) * 1975-02-10 1983-03-11 日清製粉株式会社 HOZONSEI O YUSURU YUDEMANRUI NO SEIZOUHOU
JPS5393847A (en) * 1977-01-27 1978-08-17 Nippon Sheet Glass Co Ltd Production method of light fiber
US4277271A (en) * 1978-04-21 1981-07-07 Eotec Corporation Method of manufacturing graded index optical fibers
US4289516A (en) * 1979-10-04 1981-09-15 Eotec Corporation Low loss optical fibers
JPS6025108B2 (en) * 1980-03-12 1985-06-17 満 首藤 Preservation processing methods and equipment for low moisture content foods, feeds, etc.

Also Published As

Publication number Publication date
BR8207118A (en) 1983-10-11
JPS58110441A (en) 1983-07-01
EP0082517B1 (en) 1986-03-19
NO155930C (en) 1987-06-24
ATE18661T1 (en) 1986-04-15
ES518408A0 (en) 1984-01-16
ES8402430A1 (en) 1984-01-16
NO155930B (en) 1987-03-16
DK547582A (en) 1983-06-23
EP0082517A1 (en) 1983-06-29
NO824217L (en) 1983-06-23
AU536495B2 (en) 1984-05-10
IT8168655A0 (en) 1981-12-22
AU9133082A (en) 1983-06-30
DE3270048D1 (en) 1986-04-24
IT1145605B (en) 1986-11-05
JPS5941932B2 (en) 1984-10-11

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